Have you tried adding fiber supplements to your diet (such as Citrucel or Metamucil)? Some of your symptoms (intermittent diarrhea, constipation and abdominal cramps) sound like irritable bowel syndrome, which often responds to added fiber in the diet, and to monitoring your diet for any food items that bring on these symptoms. Bleeding into the stool is another matter, and is always a source of concern, even though it is rarely due to life-threatening causes in people your age (and, especially if you have had a thorough and normal colonoscopy within the last couple of years).
It is, of course, impossible to render a specific diagnosis over the Internet, and so I advise you to make an appointment with a Gastroenterologist.
Sincerely,
Robert A. Wascher, MD, FACS
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